/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.flink.runtime.operators;

import org.apache.flink.api.common.ExecutionConfig;
import org.junit.Assert;

import org.apache.flink.api.common.functions.CrossFunction;
import org.apache.flink.runtime.operators.CrossTaskTest.MockCrossStub;
import org.apache.flink.runtime.operators.testutils.DriverTestBase;
import org.apache.flink.runtime.operators.testutils.UniformRecordGenerator;
import org.apache.flink.types.Record;
import org.junit.Test;


public class CrossTaskExternalITCase extends DriverTestBase<CrossFunction<Record, Record, Record>>
{
	private static final long CROSS_MEM = 1024 * 1024;

	private final double cross_frac;
	
	private final CountingOutputCollector output = new CountingOutputCollector();

	public CrossTaskExternalITCase(ExecutionConfig config) {
		super(config, CROSS_MEM, 0);
		cross_frac = (double)CROSS_MEM/this.getMemoryManager().getMemorySize();
	}
	
	@Test
	public void testExternalBlockCrossTask() {

		int keyCnt1 = 2;
		int valCnt1 = 1;
		
		// 43690 fit into memory, 43691 do not!
		int keyCnt2 = 43700;
		int valCnt2 = 1;
		
		final int expCnt = keyCnt1*valCnt1*keyCnt2*valCnt2;
		
		setOutput(this.output);
		
		addInput(new UniformRecordGenerator(keyCnt1, valCnt1, false));
		addInput(new UniformRecordGenerator(keyCnt2, valCnt2, false));
				
		getTaskConfig().setDriverStrategy(DriverStrategy.NESTEDLOOP_BLOCKED_OUTER_FIRST);
		getTaskConfig().setRelativeMemoryDriver(cross_frac);
		
		final CrossDriver<Record, Record, Record> testTask = new CrossDriver<Record, Record, Record>();
		
		try {
			testDriver(testTask, MockCrossStub.class);
		} catch (Exception e) {
			e.printStackTrace();
			Assert.fail("Test failed due to an exception.");
		}
		
		Assert.assertEquals("Wrong result size.", expCnt, this.output.getNumberOfRecords());
	}
	
	@Test
	public void testExternalStreamCrossTask() {

		int keyCnt1 = 2;
		int valCnt1 = 1;
		
		// 87381 fit into memory, 87382 do not!
		int keyCnt2 = 87385;
		int valCnt2 = 1;
		
		final int expCnt = keyCnt1*valCnt1*keyCnt2*valCnt2;
		
		setOutput(this.output);
		
		addInput(new UniformRecordGenerator(keyCnt1, valCnt1, false));
		addInput(new UniformRecordGenerator(keyCnt2, valCnt2, false));
				
		getTaskConfig().setDriverStrategy(DriverStrategy.NESTEDLOOP_STREAMED_OUTER_FIRST);
		getTaskConfig().setRelativeMemoryDriver(cross_frac);
		
		final CrossDriver<Record, Record, Record> testTask = new CrossDriver<Record, Record, Record>();
		
		try {
			testDriver(testTask, MockCrossStub.class);
		} catch (Exception e) {
			e.printStackTrace();
			Assert.fail("Test failed due to an exception.");
		}
		
		Assert.assertEquals("Wrong result size.", expCnt, this.output.getNumberOfRecords());
	}
}
